It's just personal taste, right? But my
changes would be:
Level 3 - AT: Tasha's Hideous Laughter,
Charm Person,
False Life
Level 4 - AT: Tasha's Hideous Laughter,
Charm Person,
False Life, Disguise Self
Level 5 - WIZ: Find Familiar, Shield, Absorb Elements,
Mage Armor, Detect Magic,
Grease
Level 6 - WIZ: Find Familiar, Shield, Absorb Elements,
Mage Armor,
Longstrider or Fog Cloud,
False Life, Alarm, Detect Magic
- I'm not a big fan of Silent Image due to the Concentration requirement and you can cover some things with Minor Illusion.
- I'm also a big fan of Charm Person to avoid unnecessary combats and also at some social situation.
- I know False Life is considered subpar, but at least in my tables THP is always good. I would select False Life earlier than Grease (or other good control spell) because you don't have too many consistent uses for your slots before getting Wizard multiclass -- usually the best choice will be to position/move/hide and attack with advantage to benefit from SA. Once you get things like Shield and Absorb Elements, you will always try to save some 1st level slots, but before that I believe False Life provides good value early on.
- I would also get Mage Armor -- AC is very hard to increase in 5e and sometimes you can see yourself without armor or get cought in surprise (although you can sleep without worries in Studded).
- From level 7 ownards, you pretty much nailed it: Mirror Image, Shadow Blade and etc. Since your Concentration will be usually dedicated to Shadow Blade, I rather get non-Concentration spells in order to avoid conflict and create good synergies.